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Soby Mathew7abebe82016-08-08 12:38:52 +01001/*
Antonio Nino Diaz659ea8e2018-03-22 20:13:44 +00002 * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
Soby Mathew7abebe82016-08-08 12:38:52 +01003 *
dp-armfa3cf0b2017-05-03 09:38:09 +01004 * SPDX-License-Identifier: BSD-3-Clause
Soby Mathew7abebe82016-08-08 12:38:52 +01005 */
6
7#include <arch.h>
8#include <asm_macros.S>
Julius Werner4e406bf2017-09-18 16:57:51 -07009#include <assert_macros.S>
10#include <console_macros.S>
Antonio Nino Diaze0f90632018-12-14 00:18:21 +000011#include <drivers/ti/uart/uart_16550.h>
Soby Mathew7abebe82016-08-08 12:38:52 +010012
Julius Werner4e406bf2017-09-18 16:57:51 -070013 /*
14 * "core" functions are low-level implementations that don't require
15 * writable memory and are thus safe to call in BL1 crash context.
16 */
17 .globl console_16550_core_init
18 .globl console_16550_core_putc
19 .globl console_16550_core_getc
Antonio Nino Diaz659ea8e2018-03-22 20:13:44 +000020 .globl console_16550_core_flush
Julius Werner4e406bf2017-09-18 16:57:51 -070021
22 .globl console_16550_putc
23 .globl console_16550_getc
Antonio Nino Diaz659ea8e2018-03-22 20:13:44 +000024 .globl console_16550_flush
Soby Mathew7abebe82016-08-08 12:38:52 +010025
26 /* -----------------------------------------------
Julius Werner4e406bf2017-09-18 16:57:51 -070027 * int console_16550_core_init(uintptr_t base_addr,
Soby Mathew7abebe82016-08-08 12:38:52 +010028 * unsigned int uart_clk, unsigned int baud_rate)
29 * Function to initialize the console without a
30 * C Runtime to print debug information. This
31 * function will be accessed by console_init and
32 * crash reporting.
33 * In: x0 - console base address
34 * w1 - Uart clock in Hz
35 * w2 - Baud rate
Julius Werner4e406bf2017-09-18 16:57:51 -070036 * Out: return 1 on success, 0 on error
Soby Mathew7abebe82016-08-08 12:38:52 +010037 * Clobber list : x1, x2, x3
38 * -----------------------------------------------
39 */
Julius Werner4e406bf2017-09-18 16:57:51 -070040func console_16550_core_init
Soby Mathew7abebe82016-08-08 12:38:52 +010041 /* Check the input base address */
42 cbz x0, init_fail
43 /* Check baud rate and uart clock for sanity */
44 cbz w1, init_fail
45 cbz w2, init_fail
46
47 /* Program the baudrate */
48 /* Divisor = Uart clock / (16 * baudrate) */
49 lsl w2, w2, #4
50 udiv w2, w1, w2
51 and w1, w2, #0xff /* w1 = DLL */
52 lsr w2, w2, #8
53 and w2, w2, #0xff /* w2 = DLLM */
54 ldr w3, [x0, #UARTLCR]
55 orr w3, w3, #UARTLCR_DLAB
56 str w3, [x0, #UARTLCR] /* enable DLL, DLLM programming */
57 str w1, [x0, #UARTDLL] /* program DLL */
58 str w2, [x0, #UARTDLLM] /* program DLLM */
59 mov w2, #~UARTLCR_DLAB
60 and w3, w3, w2
61 str w3, [x0, #UARTLCR] /* disable DLL, DLLM programming */
62
63 /* 8n1 */
64 mov w3, #3
65 str w3, [x0, #UARTLCR]
66 /* no interrupt */
67 mov w3, #0
68 str w3, [x0, #UARTIER]
Benjamin Fair4d5853d2016-10-14 01:13:33 +000069#ifdef TI_16550_MDR_QUIRK
70 /* UART must be enabled on some platforms via the MDR register */
71 str w3, [x0, #UARTMDR1]
72#endif /* TI_16550_MDR_QUIRK */
Soby Mathew7abebe82016-08-08 12:38:52 +010073 /* enable fifo, DMA */
74 mov w3, #(UARTFCR_FIFOEN | UARTFCR_DMAEN)
75 str w3, [x0, #UARTFCR]
76 /* DTR + RTS */
77 mov w3, #3
78 str w3, [x0, #UARTMCR]
79 mov w0, #1
Julius Werner4e406bf2017-09-18 16:57:51 -070080 ret
Soby Mathew7abebe82016-08-08 12:38:52 +010081init_fail:
Julius Werner4e406bf2017-09-18 16:57:51 -070082 mov w0, #0
Soby Mathew7abebe82016-08-08 12:38:52 +010083 ret
Julius Werner4e406bf2017-09-18 16:57:51 -070084endfunc console_16550_core_init
85
86#if MULTI_CONSOLE_API
87 .globl console_16550_register
88
89 /* -----------------------------------------------
Antonio Nino Diaz992c5ac2018-10-08 13:26:48 +010090 * int console_16550_register(uintptr_t baseaddr,
91 * uint32_t clock, uint32_t baud,
92 * console_16550_t *console);
Julius Werner4e406bf2017-09-18 16:57:51 -070093 * Function to initialize and register a new 16550
94 * console. Storage passed in for the console struct
95 * *must* be persistent (i.e. not from the stack).
96 * In: x0 - UART register base address
97 * w1 - UART clock in Hz
98 * w2 - Baud rate
99 * x3 - pointer to empty console_16550_t struct
100 * Out: return 1 on success, 0 on error
101 * Clobber list : x0, x1, x2, x6, x7, x14
102 * -----------------------------------------------
103 */
104func console_16550_register
105 mov x7, x30
106 mov x6, x3
107 cbz x6, register_fail
108 str x0, [x6, #CONSOLE_T_16550_BASE]
109
110 bl console_16550_core_init
111 cbz x0, register_fail
112
113 mov x0, x6
114 mov x30, x7
Soby Mathew58873ae2018-10-10 16:03:09 +0100115 finish_console_register 16550 putc=1, getc=1, flush=1
Julius Werner4e406bf2017-09-18 16:57:51 -0700116
117register_fail:
118 ret x7
119endfunc console_16550_register
120#else
121 .globl console_core_init
122 .globl console_core_putc
123 .globl console_core_getc
124 .globl console_core_flush
125 .equ console_core_init,console_16550_core_init
126 .equ console_core_putc,console_16550_core_putc
127 .equ console_core_getc,console_16550_core_getc
Antonio Nino Diaz659ea8e2018-03-22 20:13:44 +0000128 .equ console_core_flush,console_16550_core_flush
Julius Werner4e406bf2017-09-18 16:57:51 -0700129#endif
Soby Mathew7abebe82016-08-08 12:38:52 +0100130
131 /* --------------------------------------------------------
Julius Werner4e406bf2017-09-18 16:57:51 -0700132 * int console_16550_core_putc(int c, uintptr_t base_addr)
Soby Mathew7abebe82016-08-08 12:38:52 +0100133 * Function to output a character over the console. It
134 * returns the character printed on success or -1 on error.
135 * In : w0 - character to be printed
136 * x1 - console base address
137 * Out : return -1 on error else return character.
138 * Clobber list : x2
139 * --------------------------------------------------------
140 */
Julius Werner4e406bf2017-09-18 16:57:51 -0700141func console_16550_core_putc
142#if ENABLE_ASSERTIONS
143 cmp x1, #0
144 ASM_ASSERT(ne)
145#endif /* ENABLE_ASSERTIONS */
Soby Mathew7abebe82016-08-08 12:38:52 +0100146
147 /* Prepend '\r' to '\n' */
148 cmp w0, #0xA
149 b.ne 2f
150 /* Check if the transmit FIFO is full */
1511: ldr w2, [x1, #UARTLSR]
152 and w2, w2, #(UARTLSR_TEMT | UARTLSR_THRE)
153 cmp w2, #(UARTLSR_TEMT | UARTLSR_THRE)
154 b.ne 1b
155 mov w2, #0xD /* '\r' */
156 str w2, [x1, #UARTTX]
Soby Mathew7abebe82016-08-08 12:38:52 +0100157
158 /* Check if the transmit FIFO is full */
1592: ldr w2, [x1, #UARTLSR]
160 and w2, w2, #(UARTLSR_TEMT | UARTLSR_THRE)
161 cmp w2, #(UARTLSR_TEMT | UARTLSR_THRE)
162 b.ne 2b
163 str w0, [x1, #UARTTX]
Soby Mathew7abebe82016-08-08 12:38:52 +0100164 ret
Julius Werner4e406bf2017-09-18 16:57:51 -0700165endfunc console_16550_core_putc
166
167 /* --------------------------------------------------------
168 * int console_16550_putc(int c, console_16550_t *console)
169 * Function to output a character over the console. It
170 * returns the character printed on success or -1 on error.
171 * In : w0 - character to be printed
172 * x1 - pointer to console_t structure
173 * Out : return -1 on error else return character.
174 * Clobber list : x2
175 * --------------------------------------------------------
176 */
177func console_16550_putc
178#if ENABLE_ASSERTIONS
179 cmp x1, #0
180 ASM_ASSERT(ne)
181#endif /* ENABLE_ASSERTIONS */
182 ldr x1, [x1, #CONSOLE_T_16550_BASE]
183 b console_16550_core_putc
184endfunc console_16550_putc
Soby Mathew7abebe82016-08-08 12:38:52 +0100185
186 /* ---------------------------------------------
Julius Werner4e406bf2017-09-18 16:57:51 -0700187 * int console_16550_core_getc(uintptr_t base_addr)
Soby Mathew7abebe82016-08-08 12:38:52 +0100188 * Function to get a character from the console.
189 * It returns the character grabbed on success
Julius Werner4e406bf2017-09-18 16:57:51 -0700190 * or -1 on if no character is available.
191 * In : x0 - console base address
192 * Out : w0 - character if available, else -1
Soby Mathew7abebe82016-08-08 12:38:52 +0100193 * Clobber list : x0, x1
194 * ---------------------------------------------
195 */
Julius Werner4e406bf2017-09-18 16:57:51 -0700196func console_16550_core_getc
197#if ENABLE_ASSERTIONS
198 cmp x0, #0
199 ASM_ASSERT(ne)
200#endif /* ENABLE_ASSERTIONS */
201
Soby Mathew7abebe82016-08-08 12:38:52 +0100202 /* Check if the receive FIFO is empty */
2031: ldr w1, [x0, #UARTLSR]
Julius Werner4e406bf2017-09-18 16:57:51 -0700204 tbz w1, #UARTLSR_RDR_BIT, no_char
Soby Mathew7abebe82016-08-08 12:38:52 +0100205 ldr w0, [x0, #UARTRX]
206 ret
Julius Werner4e406bf2017-09-18 16:57:51 -0700207no_char:
208 mov w0, #ERROR_NO_PENDING_CHAR
Soby Mathew7abebe82016-08-08 12:38:52 +0100209 ret
Julius Werner4e406bf2017-09-18 16:57:51 -0700210endfunc console_16550_core_getc
211
212 /* ---------------------------------------------
213 * int console_16550_getc(console_16550_t *console)
214 * Function to get a character from the console.
215 * It returns the character grabbed on success
216 * or -1 on if no character is available.
217 * In : x0 - pointer to console_t stucture
218 * Out : w0 - character if available, else -1
219 * Clobber list : x0, x1
220 * ---------------------------------------------
221 */
222func console_16550_getc
223#if ENABLE_ASSERTIONS
224 cmp x1, #0
225 ASM_ASSERT(ne)
226#endif /* ENABLE_ASSERTIONS */
227 ldr x0, [x0, #CONSOLE_T_16550_BASE]
228 b console_16550_core_getc
229endfunc console_16550_getc
Antonio Nino Diaz56ec1d52017-02-08 15:58:12 +0000230
231 /* ---------------------------------------------
Antonio Nino Diaz659ea8e2018-03-22 20:13:44 +0000232 * int console_16550_core_flush(uintptr_t base_addr)
Antonio Nino Diaz56ec1d52017-02-08 15:58:12 +0000233 * Function to force a write of all buffered
234 * data that hasn't been output.
235 * In : x0 - console base address
236 * Out : return -1 on error else return 0.
237 * Clobber list : x0, x1
238 * ---------------------------------------------
239 */
Antonio Nino Diaz659ea8e2018-03-22 20:13:44 +0000240func console_16550_core_flush
241#if ENABLE_ASSERTIONS
242 cmp x0, #0
243 ASM_ASSERT(ne)
244#endif /* ENABLE_ASSERTIONS */
245
246 /* Loop until the transmit FIFO is empty */
2471: ldr w1, [x0, #UARTLSR]
248 and w1, w1, #(UARTLSR_TEMT | UARTLSR_THRE)
249 cmp w1, #(UARTLSR_TEMT | UARTLSR_THRE)
250 b.ne 1b
251
Antonio Nino Diaz56ec1d52017-02-08 15:58:12 +0000252 mov w0, #0
253 ret
Antonio Nino Diaz659ea8e2018-03-22 20:13:44 +0000254endfunc console_16550_core_flush
255
256 /* ---------------------------------------------
257 * int console_16550_flush(console_pl011_t *console)
258 * Function to force a write of all buffered
259 * data that hasn't been output.
260 * In : x0 - pointer to console_t structure
261 * Out : return -1 on error else return 0.
262 * Clobber list : x0, x1
263 * ---------------------------------------------
264 */
265func console_16550_flush
266#if ENABLE_ASSERTIONS
267 cmp x0, #0
268 ASM_ASSERT(ne)
269#endif /* ENABLE_ASSERTIONS */
270 ldr x0, [x0, #CONSOLE_T_16550_BASE]
271 b console_16550_core_flush
272endfunc console_16550_flush